Yes, you can definitely get sick from eating poop, even in minute quantities! Although urine emerges sterile from the body (unless the person has an infection), poop emerges loaded with bacteria and sometimes other life forms. Many diseases, including food poisoning, cholera and typhus, are spread by fecal contamination. Many parasites, such as the notorious tapeworm, can be spread through deliberate or accidental ingestion of poop. There are some parasites, such as pinworms, who depend on people eating their own poop to keep the population up. Pinworms are small nematodes that live in the colon. The females emerge from the anus at night to lay their eggs. Their activity makes the anal area itch. The person scratches the itch (often doing so in his sleep), procuring a small amount of fecal matter and eggs under his fingernails, and then puts his fingers in his mouth. Once the eggs are consumed, the person is infected with a new generation of pinworms. I have read that almost everyone has pinworms. Luckily, pinworms don't do much harm. You only notice them if you have a lot of pinworms! If you want to find out if you do indeed have them, get someone to gently touch around your anal area with Scotch tape while you are sleeping. The worms will stick to the tape and you'll be able to see them.